Typst: Unnumbered headings wrapped in extraneous block element

[CoryMcCartan]

I have:

• searched the issue tracker for similar issues
• installed the latest version of Quarto CLI
• formatted my issue following the Bug Reports guide

Bug description

When you have a heading that is unnumbered, as happens e.g. with the "Level two" heading below, Quarto converts it not to a Typst heading but one wrapped in a #block()

There may be a very good reason for this behavior, in which case I apologize, but the document renders fine without the #block, and indeed numbered headings are not wrapped in a #block().
The reason it causes problems is that I would like to render these headings inline (like paragraphs in TeX; Quarto has a block-headings option for that format which controls this), which I would accomplish with a show rule something like this:

show heading: it => {
    if it.numbering == none {
        it.body
    } else {
        block(counter(heading).display(it.numbering) + h(1em) + it.body)
    }
}

However, because the heading gets wrapped in a #block, this is not possible.

Looks like the expansion into the full #heading() call happens here, but I don't see there where the #block is applied.

Steps to reproduce

---
format: 
    typst:
        keep-typ: true
        number-depth: 1
---

# Level one

## Level two

Actual behavior

in Typst output:

// ... (template code)
= Level one
<level-one>
#block[
#heading(
level: 
2
, 
numbering: 
none
, 
[
Level two
]
)
]

Expected behavior

// ... (template code)
= Level one
<level-one>

#heading(level: 2, numbering: none, [Level two])

Your environment

• OS: MacOS 15.6
• IDE: none

Quarto check output

Quarto 1.7.29
[✓] Checking environment information...
      Quarto cache location: /Users/cmccartan/Library/Caches/quarto
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.6.3: OK
      Dart Sass version 1.85.1: OK
      Deno version 1.46.3: OK
      NOTE: Typst version 0.13.1 does not strictly match 0.13.0 and strict checking is enabled. Please use 0.13.0.
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.7.29
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: (external install)
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/cmccartan/Library/TinyTeX/bin/universal-darwin
      Version: 2025

[✓] Checking Chrome Headless....................OK
      Using: Chrome found on system
      Path: /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
      Source: MacOS known location

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.9.6
      Path: /Library/Developer/CommandLineTools/usr/bin/python3
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with python3 -m pip install jupyter

[✓] Checking R installation...........OK
      Version: 4.5.0
      Path: /Library/Frameworks/R.framework/Resources
      LibPaths:
        - /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library
      knitr: 1.50
      rmarkdown: 2.29

[✓] Checking Knitr engine render......OK

[mcanouil]

The #block part is an addition from Quarto compared to Pandoc.

echo "## Title {.unnumbered}" | quarto pandoc --from markdown --to typst

#heading(level: 2, numbering: none)[Title]
<title>